Malicious PDF — malware analysis report

Static analysis result for SHA-256 8799066a35afb1fe…

MALICIOUS

PDF

100.6 KB Created: 2021-07-15 18:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 626ad608e22fbd38a642fa40fe580d46 SHA-1: 89e7bf803e0f573350696272d70069f5418bb7cc SHA-256: 8799066a35afb1fe45b72e6ab035f02e39ced7c4e9007350f1165e00dd7a4e71
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress upload storage, suggesting a link farm designed to distribute malicious content or manipulate search engine results. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9803

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6a215aa80---8085977351.pdf In PDF document text
    • https://sasalidayanisma.org/uploads/file/92132233621.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/walirelirefap.pdfIn PDF document text
    • https://bbgpiti.com/userfiles/files/68932840501.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/6439526017.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/pufikimot.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/988d7e5889c81b06dd9c1596c78620ac/vibiv.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/tizajin.pdfIn PDF document text
    • https://actor-conseil.com/files/file/89804735890.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/tar8scsnrkohm95a8qlp0ia1jn/76727907917.pdfIn PDF document text
    • https://netpage.info/userfiles/file/vuxurugatapewubuwosuvirej.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/fikejek.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607747c22553c---roporuzekanozevemikiwer.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa457cee31e---33401382904.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8786f49999aa47102fef403411f6916d/41733828061.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160748fe72fe74---fawidopepozorujenuxasun.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/vuduz.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/d4d7j0kesackosic9mga7l1m30/36584456781.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/rirudokalomaburazegume.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd35f6119b---24389407477.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16080cd6ab365e---nelovesaxazazugelazozej.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/jff3qifm7us0r919muvuct2jpb/75833270767.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607739e93d2ea---61975423248.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///fijafu.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160798cdb6ad3a---rekenimode.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/nee6f1f9n28bt1gqcboirjh1n8/57816052463.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=nobody+can+give+you+freedom+malcolm+xPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000125d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D2 17408 bytes
SHA-256: 094fa2480a973d9295a53e7afb3de02fc82ec3b039ecbcd0f688ad81db082267
font_01_sfnt_off00015333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15333 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B4A 11052 bytes
SHA-256: 39f297c60173fae2c861cc43a91ae32aff1a5e89ed3e14ddab74ab9268578304